Filter out files by extension in vim NERDTree

if u would like to \*.pyc files not to be shown in NERDTree vim plugin.

just setting NERDTreeIgnore option in your .vimrc.

let NERDTreeIgnore = ['\.pyc$']

from http://stackoverflow.com/questions/5601749/how-to-filter-out-files-by-extension-in-nerdtree